Trouble in the MooT

Letter found in Shrine

This letter or message was found by Salvik in Ovilar’s hastily abandoned room in the shrine.
A short poem written in a Dwarven.letter cipher. (Partially deciphered)
Geddragg managed to complete the deciphering. (Geddragg earned 1 Skill Rank in Ciphers) to reveal:

The Tower is high upon the hill
The stone in far below
Between the two empty yet filled
is what you seek to know.